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diff --git a/README.md b/README.md
index f3f2a7a..408ec5f 100644
--- a/README.md
+++ b/README.md
@@ -161,6 +161,9 @@ and `Meetings` headings beneath each day entry.
 Org buffers enable `olivetti-mode` automatically for a centered writing layout
 in both GUI and terminal Emacs sessions.
 
+Invisible edits in Org are blocked with an error rather than silently changing
+hidden content.
+
 Questions that come up during the day can be tracked as Org tasks under the
 day's `Tasks` heading. The intended task workflow is `TODO`, `CLARIFY`,
 `WAIT`, `DONE`, and `CANCELLED`: use `CLARIFY` for open questions or ambiguity,